MICROCHIP ADM00599 Operating instructions

Brand: MICROCHIP

Model: ADM00599

Type: Operating instructions

 2017 Microchip Technology Inc. DS50002648A

MCP8026

TQFP BLDC Motor Driver

Evaluation Board

User’s Guide

DS50002648A-page 2  2017 Microchip Technology Inc.

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ISBN: 978-1-5224-2179-5

 2017 Microchip Technology Inc. DS50002648A-page 3

EU Declaration of Conformity

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The development/evaluation tool is designed to be used for research and development in a laboratory environment. This

development/evaluation tool is not a Finished Appliance, nor is it intended for incorporation into Finished Appliances that are made

commercially available as single functional units to end users under EU EMC Directive 2004/108/EC and as supported by the European

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This development/evaluation tool complies with EU RoHS2 Directive 2011/65/EU.

This development/evaluation tool, when incorporating wireless and radio-telecom functionality, is in compliance with the essential

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Signed for and on behalf of Microchip Technology Inc. at Chandler, Arizona, USA.

Object of Declaration: MCP8026 TQFP BLDC Motor Driver Evaluation Board

Automotive Networking Development Board User’s Guide

DS50002648A-page 4  2017 Microchip Technology Inc.

NOTES:

MCP8026 TQFP BLDC MOTOR

DRIVER EVALUATION BOARD

USER’S GUIDE

 2017 Microchip Technology Inc. DS50002648A-page 5

Table of Contents

Preface ........................................................................................................................... 7

Introduction............................................................................................................ 7

Document Layout .................................................................................................. 7

Conventions Used in this Guide ............................................................................ 8

Recommended Reading........................................................................................ 9

The Microchip Web Site ........................................................................................ 9

Development Systems Customer Change Notification Service .......................... 10

Customer Support ............................................................................................... 10

Document Revision History ................................................................................. 10

Chapter 1. Product Overview

1.1 Introduction ................................................................................................... 11

1.2 What Is the MCP8026 TQFP BLDC Motor Driver Evaluation Board? .......... 12

1.3 What Does the MCP8026 TQFP BLDC Motor Driver Evaluation Board

Kit Include? ............................................................................................. 12

Chapter 2. Installation and Operation

2.1 Introduction ................................................................................................... 13

2.2 Features ....................................................................................................... 13

2.3 Getting Started ............................................................................................. 14

2.3.1 Connections .............................................................................................. 14

2.3.2 Operating a Motor ..................................................................................... 17

2.3.3 Indicator LEDs ........................................................................................... 17

2.3.4 Test Points ................................................................................................ 17

2.3.5 Reprogramming the On-Board dsPIC33EP256MC504 ............................. 19

2.3.6 Configuring the MCP8026 ......................................................................... 19

2.3.7 MCP8026 Configuration Message Responses .......................................... 21

2.3.8 MCP8026 Status Messages ...................................................................... 23

2.3.9 MCP8026 Register Definitions .................................................................. 24

Appendix A. Schematic and Layouts

A.1 Introduction .................................................................................................. 29

A.2 Board – Schematic ....................................................................................... 30

A.3 Board – Top Silk .......................................................................................... 31

A.4 Board – Top Copper .................................................................................... 32

A.5 Board – Bottom Copper ............................................................................... 33

A.6 Board – MID1 Copper .................................................................................. 34

A.7 Board – MID2 Copper .................................................................................. 35

Appendix B. Bill of Materials....................................................................................... 37

MCP8026 TQFP BLDC Motor Driver Evaluation Board User’s Guide

DS50002648A-page 6  2017 Microchip Technology Inc.

Appendix C. Software

C.1 Software Location ........................................................................................ 41

C.2 Selected Software Constants and Definitions .............................................. 41

C.3 dsPIC33EP256MC504 PIM Port Usage ...................................................... 43

C.3.1 Port A Mapping ..........................................................................................43

C.3.2 Port B Mapping ..........................................................................................43

C.3.3 Port C Mapping .........................................................................................44

C.3.4 A/D Mappings ............................................................................................44

C.3.5 UART Mappings ........................................................................................44

C.4 Communications Message Mappings .......................................................... 44

C.5 MPLAB X Compiler Startup ......................................................................... 45

C.6 MPLAB X IDE and PICkit 3 Exercise ........................................................... 45

Worldwide Sales and Service .....................................................................................47

MCP8026 TQFP BLDC MOTOR

DRIVER EVALUATION BOARD

USER’S GUIDE

 2017 Microchip Technology Inc. DS50002648A-page 7

Preface

INTRODUCTION

This chapter contains general information that will be useful to know before using the

MCP8026 TQFP BLDC Motor Driver Evaluation Board. Items discussed in this chapter

include:

• Document Layout

• Conventions Used in this Guide

• Recommended Reading

• The Microchip Web Site

• Customer Support

• Document Revision History

DOCUMENT LAYOUT

This document describes how to use the MCP8026 TQFP BLDC Motor Driver

Evaluation Board as a development tool to emulate and debug firmware on a target

board. The manual layout is as follows:

•Chapter 1. “Product Overview” – Important information about the MCP8026

TQFP BLDC Motor Driver Evaluation Board.

•Chapter 2. “Installation and Operation” – Includes instructions on how to get

started with this user’s guide and a description of the user’s guide.

•Appendix A. “Schematic and Layouts” – Shows the schematic and layout

diagrams for the MCP8026 TQFP BLDC Motor Driver Evaluation Board.

•Appendix B. “Bill of Materials” – Lists the parts used to build the MCP8026

TQFP BLDC Motor Driver Evaluation Board.

•Appendix C. “Software” – Provides information about the application firmware

and where the source code can be found.

NOTICE TO CUSTOMERS

All documentation becomes dated, and this manual is no exception. Microchip tools and

documentation are constantly evolving to meet customer needs, so some actual dialogs

and/or tool descriptions may differ from those in this document. Please refer to our web site

(www.microchip.com) to obtain the latest documentation available.

Documents are identified with a “DS” number. This number is located on the bottom of each

page, in front of the page number. The numbering convention for the DS number is

“DSXXXXXXXXA”, where “XXXXXXXX” is the document number and “A” is the revision level

of the document.

For the most up-to-date information on development tools, see the MPLAB® IDE online help.

Select the Help menu, and then Topics to open a list of available online help files.

MCP8026 TQFP BLDC Motor Driver Evaluation Board User’s Guide

DS50002648A-page 8  2017 Microchip Technology Inc.

CONVENTIONS USED IN THIS GUIDE

This manual uses the following documentation conventions:

DOCUMENTATION CONVENTIONS

Description Represents Examples

Arial font:

Italic characters Referenced books MPLAB® IDE User’s Guide

Emphasized text ...is the only compiler...

Initial caps A window the Output window

A dialog the Settings dialog

A menu selection select Enable Programmer

Quotes A field name in a window or

dialog

“Save project before build”

Underlined, italic text with

right angle bracket

A menu path File>Save

Bold characters A dialog button Click OK

A tab Click the Power tab

N‘Rnnnn A number in verilog format,

where N is the total number of

digits, R is the radix and n is a

digit.

4‘b0010, 2‘hF1

Text in angle brackets < > A key on the keyboard Press <Enter>, <F1>

Courier New font:

Plain Courier New Sample source code #define START

Filenames autoexec.bat

File paths c:\mcc18\h

Keywords _asm, _endasm, static

Command-line options -Opa+, -Opa-

Bit values 0, 1

Constants 0xFF, ‘A’

Italic Courier New A variable argument file.o, where file can be

any valid filename

Square brackets [ ] Optional arguments mcc18 [options] file

[options]

Curly brackets and pipe

character: { | }

Choice of mutually exclusive

arguments; an OR selection

errorlevel {0|1}

Ellipses... Replaces repeated text var_name [,

var_name...]

Represents code supplied by

user

void main (void)

{ ...

}

Preface

 2017 Microchip Technology Inc. DS50002648A-page 9

RECOMMENDED READING

This user's guide describes how to use the MCP8026 TQFP BLDC Motor Driver

Evaluation Board. Other useful documents are listed below. The following Microchip

documents are available and recommended as supplemental reference resources.

• MCP8025/6 – “3-Phase Brushless DC (BLDC) Motor Gate Driver with Power

Module, Sleep Mode, and LIN Transceiver” (DS20005339) — This data sheet

provides detailed information regarding the MCP8025/6 product family.

• dsPIC33EPXXXGP50X, dsPIC33EPXXXMC20X/50X and

PIC24EPXXXGP/MC20X – “16-Bit Microcontrollers and Digital Signal

Controllers with High-Speed PWM, Op Amps and Advanced Analog”

(DS70000657) — This data sheet provides detailed information regarding the

dsPIC33EP256MC504 product family.

•“dsPIC33E/PIC24E Family Reference Manual” (DS70573)

•“dsPIC33EPXXXGP50X, dsPIC33EPXXXMC20X/50X, and

PIC24EPXXXGP/MC20X Family Silicon Errata and Data Sheet Clarification”

(DS80000533G) — This data sheet contains anomalies and clarifications for the

dsPIC33EPXXXMC504 processor.

• AN1078 – “Sensorless Field Oriented Control of a PMSM” (DS01078)

• AN1160 – “Sensorless BLDC Control with Back-EMF Filtering Using a

Majority Function” (DS01160)

• AN992 – “Sensorless BLDC Motor Control Using dsPIC30F2010” (DS00992)

• AN1292 – “Sensorless Field Oriented Control (FOC) for a Permanent Magnet

Synchronous Motor (PMSM) Using a PLL Estimator and Field Weakening

(FW)” (DS01292)

• AN901 – “Using the dsPIC30F for Sensorless BLDC Control” (DS00901)

THE MICROCHIP WEB SITE

Microchip provides online support via our web site at www.microchip.com. This web

site is used as a means to make files and information easily available to customers.

Accessible by using your favorite Internet browser, the web site contains the following

information:

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programs, design resources, user’s guides and hardware support documents,

latest software releases and archived software

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support requests, online discussion groups, Microchip consultant program

member listing

•Business of Microchip – Product selector and ordering guides, latest Microchip

press releases, listing of seminars and events, listings of Microchip sales offices,

distributors and factory representatives

MCP8026 TQFP BLDC Motor Driver Evaluation Board User’s Guide

DS50002648A-page 10  2017 Microchip Technology Inc.

DEVELOPMENT SYSTEMS CUSTOMER CHANGE NOTIFICATION SERVICE

Microchip’s customer notification service helps keep customers current on Microchip

products. Subscribers will receive an e-mail notification whenever there are changes,

updates, revisions or errata related to a specified product family or development tool of

interest.

To register, access the Microchip web site at www.microchip.com, click on Customer

Change Notification and follow the registration instructions.

The Development Systems product group categories are:

•Compilers – The latest information on Microchip C compilers, assemblers, linkers

and other language tools. These include all MPLAB® C compilers; all MPLAB

assemblers (including MPASM assembler); all MPLAB linkers (including MPLINK

object linker); and all MPLAB librarians (including MPLIB object librarian).

•Emulators – The latest information on Microchip in-circuit emulators.This

includes the MPLAB REAL ICE™ and MPLAB ICE 2000 in-circuit emulators.

•In-Circuit Debuggers – The latest information on the Microchip in-circuit

debuggers. This includes MPLAB ICD 3 in-circuit debuggers and PICkit 3 Debug

Express.

•MPLAB IDE – The latest information on Microchip MPLAB IDE, the Windows

Integrated Development Environment for development systems tools. This list is

focused on the MPLAB IDE, MPLAB IDE Project Manager, MPLAB Editor and

MPLAB SIM simulator, as well as general editing and debugging features.

•Programmers – The latest information on Microchip programmers. These include

production programmers such as MPLAB REAL ICE in-circuit emulator, MPLAB

ICD 3 in-circuit debugger and MPLAB PM3 device programmers. Also included

are nonproduction development programmers such as PICSTART Plus and PICkit

2 and 3 programmers.

CUSTOMER SUPPORT

Users of Microchip products can receive assistance through several channels:

• Distributor or Representative

• Local Sales Office

• Field Application Engineer (FAE)

• Technical Support

Customers should contact their distributor, representative or field application engineer

(FAE) for support. Local sales offices are also available to help customers. A listing of

sales offices and locations is included in the back of this document.

Technical support is available through the web site at:

http://www.microchip.com/support

DOCUMENT REVISION HISTORY

Revision A (July 2017)

• Initial Release of this Document.

MCP8026 TQFP BLDC MOTOR

DRIVER EVALUATION BOARD

USER’S GUIDE

 2017 Microchip Technology Inc. DS50002648A-page 11

Chapter 1. Product Overview

The MCP8026 TQFP BLDC Motor Driver Evaluation Board is used to demonstrate the

drive capabilities of the MCP8026. The board uses the MCP8026 3-Phase Brushless

DC (BLDC) motor gate driver and dsPIC33EP256MC504 processor to implement a

6-step trapezoidal BLDC motor controller.

The MCP8026 TQFP BLDC Motor Driver Evaluation Board is used to evaluate

Microchip’s MCP8026 in a BLDC motor application. As provided, the MCP8026 TQFP

BLDC Motor Driver Evaluation Board is ready to operate a BLDC motor using one

on-board push button to start and stop the motor plus one on-board potentiometer to

set motor speed. The evaluation board can drive a BLDC motor with a supply voltage

of up to 24V and a motor current up to 15 amps. The MCP8026 TQFP BLDC Motor

Driver Evaluation Board provides a 6-step trapezoidal control algorithm along with a

750 mW buck converter, 5V and 12V LDO, high-to-low level voltage translators, current

sense operational amplifiers, and Hall-effect inputs. The evaluation board provides a

status indication for the power supplies and the six on-board Pulse-Width Modulation

(PWM) inputs.

This chapter covers the following topics:

• What Is the MCP8026 TQFP BLDC Motor Driver Evaluation Board?

• What Does the MCP8026 TQFP BLDC Motor Driver Evaluation Board Kit

Include?

FIGURE 1-1: MCP8026 TQFP BLDC Motor Driver Evaluation Board Block

Diagram.

6V to 24V

Power Supply

MCP8026 Evaluation Board

Phase A

Phase C

Phase B

BLDC Motor

dsPIC33EP256MC504

MCP8026 TQFP BLDC Motor Driver Evaluation Board User’s Guide

DS50002648A-page 12  2017 Microchip Technology Inc.

1.1 WHAT IS THE MCP8026 TQFP BLDC MOTOR DRIVER EVALUATION

BOARD?

The MCP8026 TQFP BLDC Motor Driver Evaluation Board is a complete stand-alone

motor controller for brushless DC motors (BLDC). The board is capable of driving a

three-phase brushless DC motor rated at up to 15 amps and 24V. The input voltage

range for the board is 6V to 24V. The on board MCP8026 generates 5V and 12V using

internal voltage regulators. The MCP8026 also contains an internal buck regulator

which generates the power for the attached dsPIC33EP256MC504 host

microcontroller.

An input terminal block is provided to apply the input voltage to the board. An output

header and plated Printed Circuit Board (PCB) through-hole pads are also provided as

a means to connect the external motor. Two programming headers are available for

updating the firmware contained in the dsPIC33EP256MC504 using either a PICkit 3

programmer/debugger or an MPLAB® ICD3 in-circuit debugger.

An input terminal block is also supplied on the board, to allow users to connect 5V/12V

Hall sensors signals.

1.2 WHAT DOES THE MCP8026 TQFP BLDC MOTOR DRIVER EVALUATION

BOARD KIT INCLUDE?

This MCP8026 TQFP BLDC Motor Driver Evaluation Board kit includes:

• The MCP8026 TQFP BLDC Motor Driver Evaluation Board, ADM00599

• Information Sheet

MCP8026 TQFP BLDC MOTOR

DRIVER EVALUATION BOARD

USER’S GUIDE

 2017 Microchip Technology Inc. DS50002648A-page 13

Chapter 2. Installation and Operation

2.1 INTRODUCTION

The MCP8026 TQFP BLDC Motor Driver Evaluation Board demonstrates Microchip’s

3-Phase Brushless DC (BLDC) Motor Gate Driver with Power Module, MCP8026, used

in a BLDC motor drive application. When used in conjunction with a microcontroller, the

MCP8026 will provide the necessary drive signals to drive for a 3-Phase BLDC motor.

The MCP8026 contains the high-side and low-side drivers for external N-channel

MOSFETs. A dsPIC33EP256MC504 processor is used to supply the PWM inputs to the

MCP8026 as well as handle the high-speed Analog-To-Digital Conversion (ADC)

required for 50 kHz PWM operation.

The MCP8026 UART interface is used to configure the MCP8026 device and to send

fault information to the dsPIC® Digital Signal Controller (DSC). The evaluation board

firmware, available on the Microchip web site, uses a 6-step trapezoidal drive control

algorithm to demonstrate the MCP8026 capabilities.

2.2 FEATURES

The MCP8026 TQFP BLDC Motor Driver Evaluation Board has the following features:

• Input Operating Voltage Range: +6.0V to +24V

• Maximum of 500 mA of gate drive current for external N-Channel MOSFETs

• Drives up to a 15A BLDC motor

• 750 mW Buck Regulator with resistor-programmable output voltage

• ON/OFF momentary contact switch

• Reset momentary contact switch

• Spare user-programmable momentary contact switch

• PWM signal LED indicators

• PICkit 3 and MPLAB ICD 3 debugger interfaces

• Speed control potentiometer

• Terminal block for 5V and 12V Hall-effect sensors

• Programmable external MOSFET overcurrent protection

• Programmable PWM dead-time protection

• Programmable PWM blanking time for current switching spikes

• Complete “C” source code (provided on the board web page)

MCP8026 TQFP BLDC Motor Driver Evaluation Board User’s Guide

DS50002648A-page 14  2017 Microchip Technology Inc.

2.3 GETTING STARTED

The MCP8026 TQFP BLDC Motor Driver Evaluation Board is fully assembled and

tested for driving a BLDC motor. This board requires the use of an external voltage

source capable of supplying 6V to 24V at the rated motor current. A BLDC motor is also

required to evaluate the motor driver.

FIGURE 2-1: MCP8026 TQFP BLDC Motor Driver Evaluation Board PCB.

2.3.1 Connections

2.3.1.1 JUMPER SETTINGS

The MCP8026 TQFP BLDC Motor Driver Evaluation Board has several

user-configurable jumpers. The jumpers are described in Table 2-1 below.

TABLE 2-1: MCP8026 TQFP BLDC MOTOR DRIVER EVALUATION BOARD

JUMPERS

Jumper Default Position Description

JP1 (MONITOR1)

JP2 (MONITOR2)

JP3 (MONITOR3)

3-4 1-2 Connect phase current to MONITORn

3-4 Connect filtered phase to MONITORn

5-6 Connect Hall Sensor to MONITORn

JP4 1-2 1-2 Supplies 5V to the Hall Sensors

2-3 Supplies 12V to the Hall Sensors

JP15 1-2 1-2 Current Sense offset = JP6 selection

2-3 Current Sense offset = 0.0V

JP6 OFF ON Current Sense reference = 1.651V

OFF Current Sense reference = 0.992V

Installation and Operation

 2017 Microchip Technology Inc. DS50002648A-page 15

2.3.1.1.1 The jumpers and their use are described in Table 2-2.

TABLE 2-2: JUMPER DESCRIPTION

Jumper Name Position Description

JP1

Monitor 1 Input

Selection

(A/D Channel AN0)

1-2 Connects Phase A Current to Monitor 1 net

3-4 Connects Filtered Phase A Voltage to

MONITOR1 net

5-6 Connects Hall Sensor A to Monitor 1 net

JP2

Monitor 2 Input

Selection

(A/D Channel AN1)

1-2 Connects Phase B Current to Monitor 2 net

3-4 Connects Filtered Phase B Voltage to

MONITOR2 net

5-6 Connects Hall Sensor B to Monitor 2 net

JP3

Monitor 3 Input

Selection

(A/D Channel AN2)

1-2 Connects Phase C Current to Monitor 3 net

3-4 Connects Filtered Phase C Voltage to

MONITOR3 net

5-6 Connects Hall Sensor C to Monitor 3 net

JP4 — 1-2 Supplies 5V to the Hall Sensors

2-3 Supplies 12V to the Hall Sensors

JP5 — 1-2 Current Sense Offset Voltage = JP6 selection

3-4 Current Sense Offset Voltage = 0.0V

JP6 — 1-2 Current Sense Reference Voltage = 1.651V

3-4 Current Sense Reference Voltage = 0.992V

MCP8026 TQFP BLDC Motor Driver Evaluation Board User’s Guide

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The jumper settings for use with the sensorless trapezoidal drive firmware are as

described in Table 2-3.

2.3.1.2 POWERING THE MCP8026 TQFP BLDC MOTOR DRIVER EVALUATION

BOARD (REFERENCE Figure 2-2)

1. Apply the input voltage to the input power terminal block, J3. The input voltage

source should be limited to +24V. For nominal operation the input voltage should

be between +6.0V and +24V.

2. Connect the positive side of the input power source (+) to pin 2 of J3. Connect

the negative or return side (-) of the input source to pin 1 of J3. Refer to

Figure 2-2.

FIGURE 2-2: Connection and Operation Diagram.

2.3.1.3 CONNECTING A MOTOR TO THE MCP8026 TQFP BLDC MOTOR

DRIVER EVALUATION BOARD

Connect each phase winding of a three-phase BLDC motor to the appropriate terminal

of the motor terminal block, J4, terminals A,B,C.

TABLE 2-3: JUMPERS USED BY SENSORLESS TRAPEZOIDAL FIRMWARE

Jumper Position Description

JP1 (MONITOR1)

JP2 (MONITOR2)

JP3 (MONITOR3)

3-4 Connect filtered phase voltage to MONITORn

Motor

Connections

VDD

GND

Switches Tes t

Points

Power

Speed

Adjust

Debugging Programming

Connector

Command

MCP8026

dsPIC33-DSC

Installation and Operation

 2017 Microchip Technology Inc. DS50002648A-page 17

2.3.2 Operating a Motor

1. Turn the SPEED adjust potentiometer (R92) fully counter-clockwise to obtain the

slowest speed setting. Now turn the speed adjust approximately ¼ turn

clockwise to allow for 25% motor speed.

2. Turn on the power supply.

3. Press and release the RUN/STOP switch (SW2) to start the motor.

4. Turn the Speed Adjust potentiometer clockwise to increase motor speed,

counter-clockwise to decrease motor speed. The Speed Adjust changes the

PWM duty cycle of the PWM signals being sent to the MCP8026.

5. Press and release the RUN/STOP switch again to stop the motor.

2.3.3 Indicator LEDs

The MCP8026 TQFP BLDC Motor Driver Evaluation Board has ten LEDs to indicate

system status. Table 2-4 lists the LED indicators and their descriptions.

2.3.4 Test Points

There are several test points on the board to allow probing of voltages, currents and

signals. An abridged listing is shown in Table 2-5.

TABLE 2-4: LED INDICATORS

PCB Location Name Description

D11 SPARE Spare LED on dsPIC DSC RA4 port

D12 +12V +12V LDO voltage operating

D13 +5V +5V LDO voltage operating

D14 +Buck +3.3V Buck output voltage operating

D15 PWM3H PWM Phase 3 high-side input to MCP8026

D16 PWM3L PWM Phase 3 low-side input to MCP8026

D17 PWM2H PWM Phase 2 high-side input to MCP8026

D18 PWM2L PWM Phase 2 low-side input to MCP8026

D19 PWM1H PWM Phase 1 high-side input to MCP8026

D20 PWM1L PWM Phase 1 low-side input to MCP8026

TABLE 2-5: TEST POINTS DESCRIPTION

Test Point Name Description

TP1 VDD Power supply (+)

TP2, 4, 8, 9, 10 PGND Power supply ground (–)

TP3 DE2 MCP8026 DE2 communications signal

TP5 PHA Motor Phase A connection

TP6 PHB Motor Phase B connection

TP7 PHC Motor Phase C connection

VBn VBn Driver Bootstrap Voltage For Phase n

POT POT Motor Speed Potentiometer Output

ILIMIT ILIMIT ILIMIT_OUT signal from MCP8026

HVIN1 HVIN1 Level Shifter 1 input

HVIN2 HVIN2 Level Shifter 2 input

MCP8026 TQFP BLDC Motor Driver Evaluation Board User’s Guide

DS50002648A-page 18  2017 Microchip Technology Inc.

MON1 MON1 Monitor Signal 1: connects to A/D input AN0

MON2 MON2 Monitor Signal 2: connects to A/D input AN1

MON3 MON3 Monitor Signal 3: connects to A/D input AN2

LVOUT1 LVOUT1 Level Shifter 1 output

LVOUT2 LVOUT2 Level Shifter 2 output

OVP CLAMP OVP CLAMP Gate pin of supply overvoltage clamp

PHA_FIL PHA_FIL Filtered Phase A BEMF signal

PHB_FIL PHB_FIL Filtered Phase B BEMF signal

PHC_FIL PHC_FIL Filtered Phase C BEMF signal

PWM1H PWM1H PWM phase A high-side input to MCP8026

PWM1L PWM1L PWM phase A low-side input to MCP8026

PWM2H PWM2H PWM phase B high-side input to MCP8026

PWM2L PWM2L PWM phase B low-side input to MCP8026

PWM3H PWM3H PWM phase C high-side input to MCP8026

PWM3L PWM3L PWM phase C low-side input to MCP8026

Q1G Q1G Phase A high-side MOSFET gate

Q2G Q2G Phase B high-side MOSFET gate

Q3G Q3G Phase C high-side MOSFET gate

Q4G Q4G Phase C low-side MOSFET gate

Q5G Q5G Phase B low-side MOSFET gate

Q6G Q6G Phase A low-side MOSFET gate

RA2, 3, 9, 10 RA2, 3, 9, 10 dsPIC DSC spare I/O pins

RB3 RB3 dsPIC DSC spare I/O pin

RC3-9 RC3-9 dsPIC DSC spare I/O pins

V_BUCK V_BUCK Buck 3.3V output voltage

TABLE 2-5: TEST POINTS DESCRIPTION (CONTINUED)

Test Point Name Description

Installation and Operation

 2017 Microchip Technology Inc. DS50002648A-page 19

2.3.5 Reprogramming the On-Board dsPIC33EP256MC504

The on-board dsPIC33EP256MC504 may be reprogrammed with the user’s desired

firmware. The processor may be programmed by using an external power source and

either a PICkit 3, MPLAB REAL ICE in-circuit emulator or MPLAB ICD3 programmer.

1. Connect the power source to the board as explained in Section 2.3.1.2.

2. Connect a PICkit 3 to the J1 header or connect an MPLAB ICD 3 or MPLAB

REAL ICE in-circuit emulator to the J2 (RJ25) jack.

3. Start up the MPLABX Integrated Development Environment (IDE) and load the

MCP8026 TQFP BLDC Motor Driver Evaluation Board firmware project. In

MCP802X.H, replace the definition for driver type: #define DRIVER MCP8026.

4. Build the project.

5. Program the device.

6. Press the RESET switch on the board to reset the processor and allow the

processor to execute the new firmware program.

2.3.6 Configuring the MCP8026

The MCP8026 has configuration registers that may be used to modify operating

parameters of the device. The parameters are modified by sending commands to the

MCP8026 using the DE2 communication bus. The DE2 communication bus is a

half-duplex, 9600 baud, 8-bit, 1-stop bit, 1-start bit, no parity, serial communication link.

The user may add code to the evaluation board firmware to communicate with the

registers. The evaluation board software contains a subroutine which initializes the

MCP8026 registers.

There are three configuration registers that may be written to. The registers are written

to by sending a SET_CFG_X command byte followed by the desired register value byte.

The configuration messages and their respective requests are listed in Table 2-6.

Note: Note that the following project options may need to be changed for the

computer being used to build the firmware:

• Add Library libdsp-elf.a located in XC16 ???\src\Libdsp\lib

directory.

• Add XC16-as ASM Include Directory in XC16 ???\src\Libdsp\asm.

• Set Hardware tool to “ICD 3”, “REAL ICE”, or “PICkit3”.

MCP8026 TQFP BLDC Motor Driver Evaluation Board User’s Guide

DS50002648A-page 20  2017 Microchip Technology Inc.

TABLE 2-6: CONFIGURATION MESSAGE COMMANDS

Command Byte Bit Value Description

SET_CFG_0 110000001 (81H) Set Configuration Register 0

27 0Reserved

6 — (Always ‘0’ in SLEEP mode)

0Enable disconnect of 30 kΩ Level Translator pull up when CE = 0

(Default)

1Disable disconnect of 30 kΩ Level Translator pull up when CE = 0

50System enters Standby mode when CE = 0

1System enters Sleep mode when CE = 0

30 kΩ Level Translator pull up disconnect always enabled

40Unimplemented: Read as '0'

30Enable MOSFET Undervoltage Lockout (Default)

1Disable MOSFET Undervoltage Lockout

20Enable external MOSFET short circuit detection (Default)

1Disable external MOSFET short circuit detection

1:0 00 Set external MOSFET overcurrent limit to 0.250V (Default)

01 Set external MOSFET overcurrent limit to 0.500V

10 Set external MOSFET overcurrent limit to 0.750V

11 Set external MOSFET overcurrent limit to 1.000V

GET_CFG_0 110000010 (82H) Get Configuration Register 0

SET_CFG_1 110000011 (83H) Set Configuration Register 1

DAC motor current limit reference voltage

2 7:0 00H – FFH Select DAC Current Reference value

(4.503V - 0.991V)/ 255 = 13.77 mV/bit

00H = 0.991 volts

40H = 1.872 volts (40H x 0.1377 mV/bit + 0.991V) (Default)

FFH = 4.503 volts (FFH x 0.1377 mV/bit + 0.991V)

GET_CFG_1 110000100 (84H) Get Configuration Register 1

Get DAC motor current limit reference voltage

SET_CFG_2 110000111 (87H) Set Configuration Register 2

2 7:5 00H Reserved

4:2 — Driver Dead Time (For PWMH /PWML inputs)

000 2000 ns (Default)

001 1750 ns

010 1500 ns

011 1250 ns

100 1000 ns

101 750 ns

110 500 ns

111 250 ns

1:0 — Driver blanking time (ignore switching current spikes)

00 4 µs (Default)

01 2 µs

10 1 µs

11 500 ns

GET_CFG_2 110001000 (88H) Get Configuration Register 2

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